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SUGGESTED ANSWER KEY:
1. You mustn't to be extravagant. 2. I cant play tennis very well. > can’t 3. My grandad can use the internet very easily. It’s difficult for him. > can’t 4. He can does very difficult sums in his head. > do 5. She can play three instruments when she was ten. > could 6. I think everyone should be 24 years old for getting married. 7. I could learning grow plants. > learn 8. You musn’t eat something in class. > mustn’t 9. If you want to have a better life; you haven’t to be rich. > don’t have to 10.You dont have to get rich right now. > don’t have to 11.You shouldnt be so selfish. > shouldn’t 12. We have exams next week. We mustn’t start studying now. > don’t have to, must, should
